chatGPTBox is a free, MIT-licensed browser extension that puts deep ChatGPT and multi-model AI integration into Chrome, Edge, Firefox, Safari, and Android, aimed at people who want assistant features on any page rather than in a separate tab.

What it is

chatGPTBox is a JavaScript browser extension that embeds AI chat and page-aware assistance directly into the browsing experience. It runs across Chrome, Edge, Firefox, Safari, and Android, and it ships with a minified size of roughly 390 kB. The project is published under the MIT licence, and its README states plainly that it is "completely for free." It organizes its work around a small set of interaction surfaces: a dialog callable on any page, a right-click summarization action, and a standalone conversation page.

The concrete thing it replaces is the workflow of copying text out of a web page, switching to a separate chat tab or the provider's own website, and pasting it back. Instead of that round trip, chatGPTBox lets the user invoke a chat box over whatever page is open, or send the current page to a summarizer from the context menu. It also replaces dependence on a single provider: rather than being tied to one vendor's web interface, it supports multiple APIs, including the Web API for Free and Plus users, GPT-3.5, GPT-4, Claude, New Bing, Moonshot, self-hosted models, and Azure. It lives in the same space as other assistant extensions, but this registry lists no direct counterpart.

Key capabilities

• Summon the chat dialog on any page with the keyboard shortcut Ctrl + B.
• Summarize the current page from the right-click menu with Alt + B.
• Open an independent conversation page with Ctrl + Shift + H.
• Connect multiple APIs: the Web API for Free and Plus users, GPT-3.5, GPT-4, Claude, New Bing, Moonshot, self-hosted endpoints, and Azure.
• Use a Custom Model mode to point the extension at OpenAI-compatible endpoints, including setups built with litellm, one-api, Ollama, or OpenRouter.
• Run on mobile devices in addition to desktop browsers.
• Read the source to audit network behavior: the README suggests searching the code for fetch( and XMLHttpRequest( to enumerate every network call.

Who uses it and how

• Individual users on desktop browsers install it from the Chrome Web Store, Microsoft Edge Add-ons, or Firefox Add-ons, and use the keyboard shortcuts for in-page chat and summarization.
• Android users install it through the Android build described in the project wiki, giving them the same assistant surface on mobile.
• Privacy-conscious users rely on the manual-activation default, under which the extension does not transmit prompts or page content unless an AI-powered feature is triggered, as noted in issue #407.
• Users who already run local or self-hosted inference point the Custom Model mode at Ollama, or at a proxy such as litellm or one-api that converts other LLM APIs into OpenAI format.
• Contributors work against the repository's Development & Contributing wiki, the verify-configs workflow, and the pr-tests coverage pipeline.

Getting started

Install the extension from the Chrome Web Store, the Microsoft Edge Add-ons store, Firefox Add-ons, or the Safari and Android builds linked from the project wiki. The repository also lists a GitHub install path.

How it compares

This registry provides no list of paid products that chatGPTBox replaces, so no direct comparison against commercial alternatives can be made from the available facts. On the evidence given, it stands alone in this registry.

When to use it — and when not to

chatGPTBox is a client-side extension, so there is no database, storage layer, or SMTP service for a self-hoster to operate; the operational burden is limited to supplying API access, either through a provider or through a self-hosted endpoint reached via Custom Model mode. Anyone who wants a managed service with vendor support, or who needs a guarantee of which model answers a request, should look elsewhere. Worth noting before adopting: the README excerpt is largely installation and feature badges rather than structured documentation, and the repository carries 211 open issues.